Golang: Constant

By Xah Lee. Date: . Last updated: .

Constants are declared like variables, but its value cannot be changed.

example

const x = 3

Constants can be string, rune, boolean, or numeric values.

Constant must have a value.

package main

import "fmt"

func main() {
	const c1 = 345
	const c2 = true

	fmt.Println(c1, c2) // 345 true
}

Numeric Constants

Numeric constants are high-precision values.

An untyped constant takes the type needed by its context.

Reference

The Go Programming Language Specification - The Go Programming Language#Constants

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Golang

  1. Compile, Run
  2. Source Encoding
  3. Package, Import
  4. Comment
  5. Print
  6. String
  7. String Functions
  8. Print String
  9. String Backslash Escape
  10. Rune
  11. Variable
  12. Zero Value
  13. Constant
  14. If Then Else
  15. Switch/Case
  16. Loop
  17. Basic Types
  18. Array
  19. Slice
  20. Map
  21. Struct
  22. Function
  23. Closure
  24. Pointer
  25. String, Byte Slice, Rune Slice
  26. regexp
  27. Read File
  28. Write to File
  29. Walk Dir
  30. Check File Exist
  31. System Call
  32. Get Script Path
  33. Defer
  34. Random Number

Examples

  1. Match Any Regexp
  2. Find Replace
  3. Validate Links
  4. Generate Sitemap

Reference

  1. Go Spec